Knee extensor torque of men with early degrees of osteoarthritis is associated with pain, stiffness and function

Author(s)

Serrao, Paula R. M. S. ^[1] ; Gramani-Say, Karina ^[1] ; Lessi, Giovanna C. ^[1] ; Mattiello, Stela M. ^[1]

Affiliation

^[1] Univ Fed Sao Carlos UFSCar, Phys Therapy Dept, Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: BRAZILIAN JOURNAL OF PHYSICAL THERAPY; v. 16, n. 4, p. 289-294, JUL-AUG 2012.
• Web of Science Citations: 17

Abstract

BACKGROUND: Osteoarthritis (OA) is a chronic-degenerative disease. The knee is the most commonly affected joint and the symptoms are generally attributed to quadriceps muscle weakness. However, few studies have evaluated this relationship in a population with early stages of knee OA. OBJECTIVE: To investigate whether a correlation among the knee extensor torque and the three subscales of the WOMAC questionnaire in men with early stages of knee OA exists. METHOD: Twenty-one men with knee OA grades I or II (according to Kellgren and Lawrence criteria) participated in this study. The concentric and eccentric knee extensor torque were assessed using a Biodex System 3 Pro® isokinetic dynamometer, at a speed of 90º/s. Self-reported symptoms and disability were assessed using the WOMAC questionnaire. Spearman's correlation coefficient was used to test the relationship between the dependent variables (three subscales of WOMAC questionnaire) and the independent variables (average knee extensor peak torque). RESULTS: We found a strong negative correlation between the concentric extensor torque and pain (r=-0.7, p<0.001) and a moderate and negative correlation among the concentric extensor torque and stiffness (r=-0.62, p=0.002) and physical function (r=-0.54, p=0.011). Eccentric extensor torque presented a moderate and negative correlation with the three subscales of the WOMAC (r=-0.40 to 0.69, p<0.05). CONCLUSIONS: The concentric and eccentric knee extensor torque is significantly correlated with self-report symptoms of patients in initial stages of knee OA. Therefore, the strengthening of the quadriceps muscles, through concentric and eccentric exercise is indicated for these patients in order to minimize these symptoms. (AU)

• FAPESP's process: 11/06619-7 - Influence of changes of sleep in sensory-motor control and systemic inflammatory response in patients with knee osteoarthritis of grade I or II
• Grantee: Stela Márcia Mattiello
• Support Opportunities: Regular Research Grants
• FAPESP's process: 07/07200-4 - Functional, morphological and immunohistochemical aspects of the quadriceps muscle in subjects with knee Osteoarthritis grade I or II
• Grantee: Paula Regina Mendes da Silva Serrão
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)